[fullscreen] Allow fullscreen to be triggered by an orientation change event (#34)

On mobile devices, a common user experience is to have videos play inline when the device is in portrait mode and fullscreen when the user changes the orientation to landscape. Unfortunately, this is not possible on the Web because of the user gesture requirement to go fullscreen.

Changing the user gesture definition to include orientation change is unlikely a good idea because it wouldn't be appropriate for more dangerous features than fullscreen (eg. gUM). However, for fullscreen, and maybe other features, orientation change can be a good signal.

Chrome is willing to ship this ASAP. Anne, would Mozilla be interested to implement this change?

/CC @foolip 

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